Portion of an internal combustion engine



FIG. 1 is a perspective view of a portion of an internal combustion engine according to a first embodiment of the present design;

FIG. 2 is a top plan view of the portion of an internal combustion engine shown in FIG. 1;

FIG. 3 is a front elevation view of the portion of an internal combustion engine shown in FIG. 1;

FIG. 4 is a rear elevation view of the portion of an internal combustion engine shown in FIG. 1;

FIG. 5 is a right side elevation view of the portion of an internal combustion engine shown in FIG. 1; and,

FIG. 6 is a left side elevation view of the portion of an internal combustion engine shown in FIG. 1.

The broken lines shown herein are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a portion of an internal combustion engine, as shown and described. 